Results 11 to 20 of about 1,040 (238)

Non-Orthogonal Random Access in MIMO Cognitive Radio Networks: Beamforming, Power Allocation, and Opportunistic Transmission. [PDF]

open access: yesPLoS ONE, 2017
We study secondary random access in multi-input multi-output cognitive radio networks, where a slotted ALOHA-type protocol and successive interference cancellation are used.
Huifa Lin, Won-Yong Shin
doaj   +1 more source

Interference Robust Transmission for the Downlink of an OFDM-Based Mobile Communications System

open access: yesEURASIP Journal on Wireless Communications and Networking, 2008
Radio networks for future mobile communications systems, for example, 3GPP Long-Term Evolution (LTE), are likely to use an orthogonal frequency division multiplexing- (OFDM-) based air interface in the downlink with a frequency reuse factor of one to ...
Markus Konrad, Wolfgang Gerstacker
doaj   +2 more sources

Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation Architecture

open access: yesIEEE Journal of Microwaves, 2023
For simultaneous transmit (Tx) and receive (Rx), it is a common practice, with monostatic full duplex (FD) systems, to use a single antenna and a circulator to provide isolation between the transmit and receive radio chains.
Md Nurul Anwar Tarek   +4 more
doaj   +1 more source

Iterative MIMO Turbo Multiuser Detection and Equalization for STTrC-Coded Systems with Unknown Interference

open access: yesEURASIP Journal on Wireless Communications and Networking, 2004
Iterative multiuser detection in a single-carrier broadband multiple-input multiple-output (MIMO) system is studied in this paper. A minimum mean squared error (MMSE) low-complexity multiuser receiver is derived for space-division multiple-access (SDMA)
Veselinovic Nenad   +2 more
doaj   +2 more sources

New distributed beamforming techniques based on optimized elliptical arc geometry for back lobe cancellation of linear antenna arrays

open access: yesAlexandria Engineering Journal, 2022
The presence of array back lobe is a major source of interference, power loss, and degrades the signal-to-interference ratio (SIR) in wireless communication systems.
Heba S. Dawood   +3 more
doaj   +1 more source

On secure system performance over SISO, MISO and MIMO-NOMA wireless networks equipped a multiple antenna based on TAS protocol

open access: yesEURASIP Journal on Wireless Communications and Networking, 2020
This study examined how to improve system performance by equipping multiple antennae at a base station (BS) and all terminal users/mobile devices instead of a single antenna as in previous studies.
Thanh-Nam Tran, Miroslav Voznak
doaj   +1 more source

Distributed Iterative Multiuser Detection through Base Station Cooperation

open access: yesEURASIP Journal on Wireless Communications and Networking, 2008
This paper deals with multiuser detection through base station cooperation in an uplink, interference-limited, high frequency reuse scenario. Distributed iterative detection (DID) is an interference mitigation technique in which the base stations at ...
Khattak Shahid   +2 more
doaj   +2 more sources

Partial PIC-MRC Receiver Design for Single Carrier Block Transmission System over Multipath Fading Channels

open access: yesInternational Journal of Antennas and Propagation, 2012
Single carrier block transmission (SCBT) system has become one of the most popular modulation systems due to its low peak-to-average power ratio (PAPR), and it is gradually considered to be used for uplink wireless communication systems. In this paper, a
Juinn-Horng Deng, Sheng-Yang Huang
doaj   +1 more source

An Efficient Preamble Design Based on Comb-Type Pilots for Channel Estimation in FBMC/OQAM Systems

open access: yesIEEE Access, 2018
In this paper, we propose an efficient preamble design based on comb-type pilots (CTP) for channel estimation in filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) systems.
Wei Li, Daiming Qu, Tao Jiang
doaj   +1 more source

Is NOMA Efficient in Multi-Antenna Networks? A Critical Look at Next Generation Multiple Access Techniques

open access: yesIEEE Open Journal of the Communications Society, 2021
In the past few years, a large body of literature has been created on downlink Non-Orthogonal Multiple Access (NOMA), employing superposition coding and Successive Interference Cancellation (SIC), in multi-antenna wireless networks.
Bruno Clerckx   +9 more
doaj   +1 more source

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